<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		/*.father p{
			color: red;
		}*/
		.father .wu{
			color: green;
		}

	</style>
</head>
<body>

	<div class="father">
		<p>alex</p>
		<ul>
			<li>
				<p class="wu">wusir</p>
			</li>
		</ul>
	</div>

	<p class="wu">日天</p>
	
</body>
</html>